Muelu installs various files twice

Created by: nschloe

When checking for files which are overridden during the installation process, one finds that Muelu contains a few of them

$ make install
$ sort install_manifest.txt | uniq --count --repeated
      2 /opt/trilinos/private/include/trilinos/KokkosCompat_ClassicNodeAPI_Wrapper.hpp
      2 /opt/trilinos/private/include/trilinos/KokkosCompat_TMM.hpp
      2 /opt/trilinos/private/include/trilinos/KokkosCompat_View_def.hpp
      2 /opt/trilinos/private/include/trilinos/KokkosCompat_View.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_AdaptiveSaMLParameterListInterpreter.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_config.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_FactoryFactory.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_MLParameterListInterpreter.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_ParameterListInterpreter.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_RefMaxwell.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_ShiftedLaplacian.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_ShiftedLaplacianOperator.hpp
      2 /opt/trilinos/private/include/trilinos/MueLu_TpetraOperator.hpp
      2 /opt/trilinos/private/include/trilinos/TeuchosKokkosCompat_config.h
      2 /opt/trilinos/private/include/trilinos/Thyra_MueLuPreconditionerFactory.hpp
      2 /opt/trilinos/private/include/trilinos/Tpetra_CrsMatrixSolveOp.hpp

The reason for this is that the Muelu configuration installs multiple files with the same name in the same directory. It is not clear if the contents are the same, too, or if this actually presents a serious bug.

(From https://software.sandia.gov/bugzilla/show_bug.cgi?id=6428).

@trilinos/muelu